Move AttrsOwnerNode to syntax and make it public

crates/syntax/src/ast.rs

@@ -20,8 +20,8 @@ pub use self::{
     expr_ext::{ArrayExprKind, BinOp, Effect, ElseBranch, LiteralKind, PrefixOp, RangeOp},
     generated::{nodes::*, tokens::*},
     node_ext::{
-        AttrKind, FieldKind, Macro, NameLike, NameOrNameRef, PathSegmentKind, SelfParamKind,
-        SlicePatComponents, StructKind, TypeBoundKind, VisibilityKind,
+        AttrKind, AttrsOwnerNode, FieldKind, Macro, NameLike, NameOrNameRef, PathSegmentKind,
+        SelfParamKind, SlicePatComponents, StructKind, TypeBoundKind, VisibilityKind,
     },
     token_ext::*,
     traits::*,

crates/syntax/src/ast/node_ext.rs

@@ -90,6 +90,36 @@ impl NameOwner for Macro {
 
 impl AttrsOwner for Macro {}
 
+/// Basically an owned `dyn AttrsOwner` without extra boxing.
+pub struct AttrsOwnerNode {
+    node: SyntaxNode,
+}
+
+impl AttrsOwnerNode {
+    pub fn new<N: AttrsOwner>(node: N) -> Self {
+        AttrsOwnerNode { node: node.syntax().clone() }
+    }
+}
+
+impl AttrsOwner for AttrsOwnerNode {}
+impl AstNode for AttrsOwnerNode {
+    fn can_cast(_: SyntaxKind) -> bool
+    where
+        Self: Sized,
+    {
+        false
+    }
+    fn cast(_: SyntaxNode) -> Option<Self>
+    where
+        Self: Sized,
+    {
+        None
+    }
+    fn syntax(&self) -> &SyntaxNode {
+        &self.node
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum AttrKind {
     Inner,